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Copper(I) and Silver(I) Complexes of 1, 5- Methylene- and Diethylmethylene-bridged Bis(oxazoline) Ligands. In situ Cu(II)- catalyzed Oxidation of Methylene Bridge (CROSBI ID 107672)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Čaplar, Vesna ; Raza, Zlata ; Roje, Marin ; Tomišić, Vladislav ; Horvat, Gordan ; Požar, Josip ; Piantanida, Ivo ; Žinić, Mladen Copper(I) and Silver(I) Complexes of 1, 5- Methylene- and Diethylmethylene-bridged Bis(oxazoline) Ligands. In situ Cu(II)- catalyzed Oxidation of Methylene Bridge // Tetrahedron, 60 (2004), 37; 8079-8087. doi: 10.1016/j.tet.2004.06.117

Podaci o odgovornosti

Čaplar, Vesna ; Raza, Zlata ; Roje, Marin ; Tomišić, Vladislav ; Horvat, Gordan ; Požar, Josip ; Piantanida, Ivo ; Žinić, Mladen

engleski

Copper(I) and Silver(I) Complexes of 1, 5- Methylene- and Diethylmethylene-bridged Bis(oxazoline) Ligands. In situ Cu(II)- catalyzed Oxidation of Methylene Bridge

Silver(I) and copper(I) complexes of C2- symmetric bis(oxazoline) ligands were studied by UV, NMR, IR, EPR and ES-MS spectroscopies. The stability constants of the Ag- 1a and Ag- 1b complexes with 1:1 and 1:2 stoichiometries in acetonitrile were determined by NMR spectrometric titrations. The evidence of tetrahedral coordination for complex (Ag(1a)2(C was obtained from the complexation induced shifts (CIS) and NOEs. Mass spectra revealed the Cu(II) mediated oxidation of methylene bridge in copper complexes of 1a and 1b, which was in accordance with the UV, NMR, IR and EPR findings. The efficiency of Cu(I) complexes of methylene-bridged 1, 5-bis(oxazoline)s 1 as chiral catalysts in stereoselective cyclopropanation of styrene with ethyl diazoacetate, was compared to that of the dialkylmethylene-bridged 1, 5-bis(oxazoline)s 2.

bis(oxazoline) ; metal complex ; chiral catalysts

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Podaci o izdanju

60 (37)

2004.

8079-8087

objavljeno

0040-4020

1464-5416

10.1016/j.tet.2004.06.117

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Kemija

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